Camera optical lens

ABSTRACT

The present invention provides a camera optical lens including, sequentially from an object side to an image side: a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens having a negative refractive power; a fourth lens having a positive refractive power; a fifth lens having a positive refractive power; and a sixth lens having a negative refractive power. The camera optical lens satisfies following conditions: 1.00≤R10/(R11+R12)≤10.00; 0.60≤R9/(R7+R8)≤1.80; and 1.00≤R5/R3≤30.00, where R3, R5, R7, R9, and R11 denote curvature radiuses of object side surfaces of the second, third, fourth, fifth and sixth lenses, respectively; and R8, R10 and R12 denote curvature radiuses of image side surfaces of the fourth, fifth and sixth lenses, respectively. The camera optical lens can achieve high optical performance while satisfying design requirements for ultra-thin, wide-angle lenses having large apertures.

TECHNICAL FIELD

The present invention relates to the field of optical lens, and more particularly, to a camera optical lens suitable for handheld terminal devices, such as smart phones or digital cameras, and camera devices, such as monitors or PC lenses.

BACKGROUND

With the emergence of smart phones in recent years, the demand for miniature camera optical lens is increasingly higher, but in general the photosensitive devices of camera optical lens are nothing more than Charge Coupled Devices (CCDs) or Complementary Metal-Oxide Semiconductor Sensors (CMOS sensors). As the progress of the semiconductor manufacturing technology makes the pixel size of the photosensitive devices become smaller, plus the current development trend of electronic products towards better functions and thinner and smaller dimensions, miniature camera optical lenses with good imaging quality have become a mainstream in the market.

In order to obtain better imaging quality, the lens that is traditionally equipped in mobile phone cameras adopts a three-piece or four-piece lens structure. Also, with the development of technology and the increase of the diverse demands of users, and as the pixel area of photosensitive devices is becoming smaller and smaller and the requirement of the system on the imaging quality becoming increasingly higher, a five-piece or six-piece or seven-piece lens structure gradually emerges in lens designs. Although the common six-piece lens has good optical performance, its refractive power, lens spacing and lens shape settings still have some irrationality, such that the lens structure cannot achieve high optical performance while satisfying design requirements for ultra-thin, wide-angle lenses having large apertures.

SUMMARY

In view of the problems, the present invention aims to provide a camera optical lens, which can achieve high optical performance while satisfying design requirements for ultra-thin, wide-angle lenses having large apertures.

In an embodiment, the present invention provides a camera optical lens. The camera optical lens sequentially includes, from an object side to an image side: a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens having a negative refractive power; a fourth lens having a positive refractive power; a fifth lens having a positive refractive power; and a sixth lens having a negative refractive power. The camera optical lens satisfies following conditions: 1.00≤R10/(R11+R12)≤10.00; 0.60≤R9/(R7+R8)≤1.80; and 1.00≤R5/R3≤3.00, where R3 denotes a curvature radius of an object side surface of the second lens; R5 denotes a curvature radius of an object side surface of the third lens; R7 denotes a curvature radius of an object side surface of the fourth lens; R8 denotes a curvature radius of an image side surface of the fourth lens; R9 denotes a curvature radius of an object side surface of the fifth lens; R10 denotes a curvature radius of an image side surface of the fifth lens; R11 denotes a curvature radius of an object side surface of the sixth lens; and R12 denotes a curvature radius of an image side surface of the sixth lens.

As an improvement, the first lens includes an object side surface being convex in a paraxial region and an image side surface being concave in the paraxial region, and the camera optical lens satisfies following conditions: 0.40≤f1/f≤1.24; −3.28≤(R1+R2)/(R1−R2)≤−0.97; and 0.06≤d1/TTL≤0.19, where f denotes a focal length of the camera optical lens; f1 denotes a focal length of the first lens; R1 denotes a curvature radius of the object side surface of the first lens; R2 denotes a curvature radius of the image side surface of the first lens; d1 denotes an on-axis thickness of the first lens; and TTL denotes a total optical length from the object side surface of the first lens to an image plane of the camera optical lens along an optic axis.

As an improvement, the camera optical lens further satisfies following conditions: 0.63≤f1/f≤0.99; −2.05≤(R1+R2)/(R1−R2)≤−1.21; and 0.10≤d1/TTL≤0.16.

As an improvement, the object side surface of the second lens is convex in a paraxial region, and the second lens further includes an image side surface being concave in the paraxial region. The camera optical lens satisfies following conditions: −3.95≤f2/f≤−1.11; 1.08≤(R3+R4)/(R3−R4)≤5.19; and 0.02≤d3/TTL≤0.06, where f denotes a focal length of the camera optical lens; f2 denotes a focal length of the second lens; R4 denotes a curvature radius of the image side surface of the second lens; d3 denotes an on-axis thickness of the second lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.

As an improvement, the camera optical lens further satisfies following conditions: −2.47≤f2/f≤−1.39; 1.73≤(R3+R4)/(R3−R4)≤4.15; and 0.03≤d3/TTL≤0.06.

As an improvement, the object side surface of the third lens is convex in a paraxial region, and the third lens further includes an image side surface being concave in the paraxial region. The camera optical lens satisfies following conditions: −28.78≤f3/f≤−9.44; 3.12≤(R5+R6)/(R5−R6)≤12.73; and 0.03≤d5/TTL≤0.09, where f denotes a focal length of the camera optical lens; f3 denotes a focal length of the third lens; and R6 denotes a curvature radius of the image side surface of the third lens; d5 denotes an on-axis thickness of the third lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.

As an improvement, the camera optical lens further satisfies following conditions: −26.00≤f3/f≤−11.80; 5.00≤(R5+R6)/(R5−R6)≤10.18; and 0.05≤d5/TTL≤0.08.

As an improvement, the object side surface of the fourth lens is convex in a paraxial region, and the image side surface of the fourth lens is concave in the paraxial region. The camera optical lens satisfies following conditions: 2.39≤f4/f≤23.05; −19.03≤(R7+R8)/(R7−R8)≤−1.35; and 0.03≤d7/TTL≤0.09, where f denotes a focal length of the camera optical lens; f4 denotes a focal length of the fourth lens; d7 denotes an on-axis thickness of the fourth lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.

As an improvement, the camera optical lens further satisfies following conditions: 3.83≤f4/f≤180.44; −14.00≤(R7+R8)/(R7−R8)≤−1.69; and 0.04≤d7/TTL≤0.08.

As an improvement, the object side surface of the fifth lens is convex in a paraxial region, and the image side surface of the fifth lens is convex in the paraxial region. The camera optical lens satisfies following conditions: 0.47≤f5/f≤1.42; 0.31≤(R9+R10)/(R9−R10)≤1.34; and 0.09≤d9/TTL≤0.33, where f denotes a focal length of the camera optical lens; f5 denotes a focal length of the fifth lens; d9 denotes an on-axis thickness of the fifth lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.

As an improvement, the camera optical lens further satisfies following conditions: 0.76≤f5/f≤1.14; 0.50≤(R9+R10)/(R9−R10)≤1.08; and 0.09≤d9/TTL≤0.26.

As an improvement, the object side surface of the sixth lens is concave in a paraxial region, and the image side surface of the sixth lens is concave in the paraxial region. The camera optical lens satisfies following conditions: −1.28≤f6/f≤−0.40; 0.02≤(R11+R12)/(R11−R12)≤0.57; and 0.05≤d11/TTL≤0.14, where f denotes a focal length of the camera optical lens; f6 denotes a focal length of the sixth lens; d11 denotes an on-axis thickness of the sixth lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.

As an improvement, the camera optical lens further satisfies following conditions: −0.80≤f6/f≤−0.50; 0.03≤(R11+R12)/(R11−R12)≤0.45; and 0.07≤d11/TTL≤0.11.

As an improvement, an F number FNO of the camera optical lens is smaller than or equal to 1.97.

As an improvement, the F number FNO of the camera optical lens is smaller than or equal to 1.93.

As an improvement, a total optical length TTL from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis is smaller than or equal to 7.15 mm.

As an improvement, the total optical length TTL is smaller than or equal to 6.82 mm.

The present invention has advantageous effects in that the camera optical lens according to the present invention has excellent optical characteristics and is ultra-thin, wide-angle and has a large aperture, making it especially suitable for high-pixel camera optical lens assembly of mobile phones and WEB camera optical lenses formed by camera elements such as CCD and CMOS.

BRIEF DESCRIPTION OF DRAWINGS

Many aspects of the exemplary embodiment can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present invention. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.

FIG. 1 is a schematic diagram of a structure of a camera optical lens in accordance with Embodiment 1 of the present invention;

FIG. 2 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 1;

FIG. 3 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 1;

FIG. 4 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 1;

FIG. 5 is a schematic diagram of a structure of a camera optical lens in accordance with Embodiment 2 of the present invention;

FIG. 6 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 5;

FIG. 7 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 5;

FIG. 8 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 5;

FIG. 9 is a schematic diagram of a structure of a camera optical lens in accordance with Embodiment 3 of the present invention;

FIG. 10 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 9;

FIG. 11 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 9; and

FIG. 12 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 9.

DESCRIPTION OF EMBODIMENTS

The present invention will hereinafter be described in detail with reference to several exemplary embodiments. To make the technical problems to be solved, technical solutions and beneficial effects of the present invention more apparent, the present invention is described in further detail together with the figure and the embodiments. It should be understood the specific embodiments described hereby is only to explain the disclosure, not intended to limit the disclosure.

Embodiment 1

Referring to FIG. 1, the present invention provides a camera optical lens 10. FIG. 1 shows the camera optical lens 10 according to Embodiment 1 of the present invention. The camera optical lens 10 includes six lenses. Specifically, the camera optical lens 10 includes, sequentially from an object side to an image side, an aperture S1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6. An optical element such as a glass filter can be arranged between the seventh lens L7 and an image plane Si.

The first lens L1 has a positive refractive power, the second lens L2 has a negative refractive power, the third lens L3 has a negative refractive power, the fourth lens L4 has a positive refractive power, the fifth lens L5 has a positive refractive power, and the sixth lens L6 has a negative refractive power.

The first lens L1 is made of a plastic material, the second lens L2 is made of a plastic material, the third lens L3 is made of a plastic material, the fourth lens L4 is made of a plastic material, the fifth lens L5 is made of a plastic material, and the sixth lens L6 is made of a plastic material. In other embodiments, the lenses may be made of other material.

A curvature radius of an image side surface of the fifth lens L5 is defined as R10, a curvature radius of an object side surface of the sixth lens L6 is defined as R11, and a curvature radius of an image side surface of the sixth lens L6 is defined as R12. The camera optical lens 10 should satisfy a condition of 1.00≤R10/(R11+R12)≤10.00, which specifies a ratio of the curvature radius of the image side surface of the fifth lens L5 to a sum of the curvature radius of the object side surface of the sixth lens L6 and the curvature radius of the image side surface of the sixth lens L6. This can facilitate improving performance of the optical system with development towards wide-angle lenses.

A curvature radius of an object side surface of the fourth lens L4 is defined as R7, a curvature radius of an image side surface of the fourth lens L4 is defined as R8, and a curvature radius of an object side surface of the fifth lens L5 is defined as R9. The camera optical lens 10 should satisfy a condition of 0.60≤R9/(R7+R8)≤1.80, which specifies a ratio of the curvature radius of the object side surface of the fifth lens L5 to a sum of the curvature radius of the object side surface of the fourth lens L4 and the curvature radius of the image side surface of the fourth lens L4. This can reduce the vulnerability of the camera optical lens 10 to an eccentricity of the fourth lens with development towards wide-angle lenses, thereby improving production yield.

A curvature radius of an object side surface of the second lens L2 is defined as R3, and a curvature radius of an object side surface of the third lens L3 is defined as R5. The camera optical lens 10 should satisfy a condition of 1.00≤R5/R3≤3.00, which specifies a ratio of the curvature radius of the object side surface of the third lens to the curvature radius of the object side surface of the second lens. This can prevent the third lens from being too curved and facilitate reducing the vulnerability of the camera optical lens to an eccentricity of the second lens, thereby improving production yield.

In an embodiment, an object side surface of the first lens L1 is convex in a paraxial region and an image side surface of the first lens L1 is concave in the paraxial region.

A focal length of the camera optical lens 10 is defined as f, and a focal length of the first lens L1 is defined as f1. The camera optical lens 10 should satisfy a condition of 0.40≤f1/f≤1.24, which specifies a ratio of the focal length of the first lens to the focal length of the camera optical lens. When the condition is satisfied, the first lens can have an appropriate positive refractive power, thereby facilitating reducing aberrations of the system while facilitating development towards ultra-thin, wide-angle lenses. As an example, 0.63≤f1/f≤0.99.

A curvature radius of the object side surface of the first lens L1 is defined as R1, and a curvature radius of the image side surface of the first lens L1 is defined as R2. The camera optical lens 10 should satisfy a condition of −3.28≤(R1+R2)/(R1−R2)≤−0.97. This can reasonably control a shape of the first lens L1, so that the first lens L1 can effectively correct spherical aberrations of the system. As an example, −2.05≤(R1+R2)/(R1−R2)≤−1.21.

An on-axis thickness of the first lens L1 is defined as d1, and a total optical length from the object side surface of the first lens L1 to an image plane of the camera optical lens 10 along an optic axis is defined as TTL. The camera optical lens 10 should satisfy a condition of 0.06≤d1/TTL≤0.19. This can facilitate achieving ultra-thin lenses. As an example, 0.10≤d1/TTL≤0.16.

In an embodiment, the object side surface of the second lens L2 is convex in a paraxial region and an image side surface of the second lens L2 is concave in the paraxial region.

The focal length of the camera optical lens 10 is f, and the focal length of the second lens L2 is f2. The camera optical lens 10 further satisfies a condition of −3.95≤f2/f≤−1.11. By controlling the negative refractive power of the second lens L2 within the reasonable range, correction of aberrations of the optical system can be facilitated. As an example, −2.47≤f2/f≤−1.39.

A curvature radius of the object side surface of the second lens L2 is defined as R3, and a curvature radius of the image side surface of the second lens L2 is defined as R4. The camera optical lens 10 should satisfy a condition of 1.08≤(R3+R4)/(R3−R4)≤5.19, which specifies a shape of the second lens L2. This can facilitate correction of an on-axis aberration with development towards ultra-thin, wide-angle lenses. As an example, 1.73≤(R3+R4)/(R3−R4)≤4.15.

An on-axis thickness of the second lens L2 is defined as d3, and the total optical length from the object side surface of the first lens L1 to an image plane of the camera optical lens 10 along an optic axis is defined as TTL. The camera optical lens 10 should satisfy a condition of 0.02≤d3/TTL≤0.06. This can facilitate achieving ultra-thin lenses. As an example, 0.03≤d3/TTL≤0.06.

In an embodiment, the object side surface of the third lens L3 is convex in a paraxial region and an image side surface of the third lens L3 is concave in the paraxial region.

The focal length of the camera optical lens 10 is f, and the focal length of the third lens L3 is f3. The camera optical lens 10 further satisfies a condition of −28.78≤f3/f≤−9.44. The appropriate distribution of the refractive power leads to better imaging quality and a lower sensitivity. As an example, −26.00≤f3/f≤−11.80.

A curvature radius of the object side surface of the third lens L3 is defined as R5, and a curvature radius of the image side surface of the third lens L3 is defined as R6. The camera optical lens 10 should satisfy a condition of 3.12≤(R5+R6)/(R5−R6)≤12.73. This specifies a shape of the third lens L3. When the condition is satisfied, the deflection of light passing through the lens can be alleviated, and aberrations can be effectively reduced. As an example, 5.00≤(R5+R6)/(R5−R6)≤10.18.

An on-axis thickness of the third lens L3 is defined as d5, and the total optical length from the object side surface of the first lens L1 to an image plane of the camera optical lens 10 along an optic axis is defined as TTL. The camera optical lens 10 should satisfy a condition of 0.03≤d5/TTL≤0.09. This can facilitate achieving ultra-thin lenses. As an example, 0.05≤d5/TTL≤0.08.

The object side surface of the fourth lens L4 is convex in a paraxial region and the image side surface of the fourth lens L4 is concave in the paraxial region.

The focal length of the camera optical lens 10 is f, and the focal length of the fourth lens L4 is f4. The camera optical lens 10 further satisfies a condition of 2.39≤f4/f≤23.05. The appropriate distribution of the positive refractive power leads to better imaging quality and a lower sensitivity. As an example, 3.83≤f4/f≤18.44.

A curvature radius of the object side surface of the fourth lens L4 is defined as R7, and a curvature radius of the image side surface of the fourth lens L4 is defined as R8. The camera optical lens 10 should satisfy a condition of −19.03≤(R7+R8)/(R7−R8)≤−1.35, which specifies a shape of the fourth lens L4. This can facilitate correction of an off-axis aberration with development towards ultra-thin, wide-angle lenses. As an example, −14.00≤(R7+R8)/(R7−R8)≤−1.69.

An on-axis thickness of the fourth lens L4 is defined as d7, and the total optical length from the object side surface of the first lens L1 to an image plane of the camera optical lens 10 along an optic axis is defined as TTL. The camera optical lens 10 should satisfy a condition of 0.03≤d7/TTL≤0.09. This can facilitate achieving ultra-thin lenses. As an example, 0.04≤d7/TTL≤0.08.

In an embodiment, the object side surface of the fifth lens L5 is convex in a paraxial region, and the image side surface of the fifth lens L5 is convex in the paraxial region.

The focal length of the camera optical lens 10 is f, and the focal length of the fifth lens L5 is f5. The camera optical lens 10 further satisfies a condition of 0.47≤f5/f≤1.42. This condition can effectively make a light angle of the camera optical lens 10 gentle and reduce the tolerance sensitivity. As an example, 0.76≤f5/f≤1.14.

A curvature radius of the object side surface of the fifth lens L5 is defined as R9, and a curvature radius of the image side surface of the fifth lens L5 is defined as R10. The camera optical lens 10 should satisfy a condition of 0.31≤(R9+R10)/(R9−R10)≤1.34, which specifies a shape of the fifth lens L5. This can facilitate correction of an off-axis aberration with development towards ultra-thin, wide-angle lenses. As an example, 0.50≤(R9+R10)/(R9−R10)≤1.08.

An on-axis thickness of the fifth lens L5 is defined as d9, and the total optical length from the object side surface of the first lens L1 to an image plane of the camera optical lens 10 along an optic axis is defined as TTL. The camera optical lens 10 should satisfy a condition of 0.09≤d9/TTL≤0.33. This can facilitate achieving ultra-thin lenses. As an example, 0.09≤d9/TTL≤0.26.

In an embodiment, the object side surface of the sixth lens L6 is concave in a paraxial region, and the image side surface of the sixth lens L6 is concave in the paraxial region.

The focal length of the camera optical lens 10 is f, and the focal length of the sixth lens L6 is f6. The camera optical lens 10 further satisfies a condition of −1.28≤f6/f≤−0.40. The appropriate distribution of the refractive power leads to better imaging quality and a lower sensitivity. As an example, −0.80≤f6/f≤−0.50.

A curvature radius of the object side surface of the sixth lens L6 is defined as R11, and a curvature radius of the image side surface of the sixth lens L6 is defined as R12. The camera optical lens 10 should satisfy a condition of 0.02≤(R11+R12)/(R11−R12)≤0.57, which specifies a shape of the sixth lens L6. This can facilitate correction of an off-axis aberration with development towards ultra-thin, wide-angle lenses. As an example, 0.03≤(R11+R12)/(R11−R12)≤0.45.

An on-axis thickness of the sixth lens L6 is defined as d11, and the total optical length from the object side surface of the first lens L1 to an image plane of the camera optical lens 10 along an optic axis is defined as TTL. The camera optical lens 10 should satisfy a condition of 0.05≤d11/TTL≤0.14. This can facilitate achieving ultra-thin lenses. As an example, 0.07≤d11/TTL≤0.11.

In this embodiment, the total optical length TTL of the camera optical lens 10 is smaller than or equal to 7.15 mm, which is beneficial for achieving ultra-thin lenses. As an example, the total optical length TTL of the camera optical lens 10 is smaller than or equal to 6.82 mm.

In this embodiment, an F number of the camera optical lens 10 is smaller than or equal to 1.97. The camera optical lens 10 has a large aperture and better imaging performance. As an example, the F number of the camera optical lens 10 is smaller than or equal to 1.93.

With such design, the total optical length TTL of the camera optical lens 10 can be made as short as possible, and thus the miniaturization characteristics can be maintained.

When the above conditions are satisfied, the camera optical lens 10 will have high optical performance while satisfying design requirements for ultra-thin, wide-angle lenses having large apertures. With these characteristics, the camera optical lens 10 is especially suitable for high-pixel camera optical lens assembly of mobile phones and WEB camera optical lenses formed by imaging elements such as CCD and CMOS.

In the following, examples will be used to describe the camera optical lens 10 of the present invention. The symbols recorded in each example will be described as follows. The focal length, on-axis distance, curvature radius, on-axis thickness, inflexion point position, and arrest point position are all in units of mm.

TTL: Optical length (the total optical length from the object side surface of the first lens L1 to the image plane of the camera optical lens along the optic axis) in mm.

F number (FNO): a ratio of an effective focal length of the camera optical lens to an entrance pupil diameter of the camera optical lens.

In an example, inflexion points and/or arrest points can be arranged on the object side surface and/or image side surface of the lens, so as to satisfy the demand for the high quality imaging. The description below can be referred to for specific implementations.

Table 1 and Table 2 show design data of the camera optical lens 10 according to Embodiment 1 of the present invention.

TABLE 1 R d nd vd S1 ∞ d0= −0.618 R1 1.957 d1= 0.842 nd1 1.5444 v1 55.82 R2 8.052 d2= 0.125 R3 5.701 d3= 0.250 nd2 1.6700 v2 19.39 R4 3.143 d4= 0.417 R5 17.074 d5= 0.400 nd3 1.5844 v3 28.22 R6 12.360 d6= 0.096 R7 10.857 d7= 0.400 nd4 1.6359 v4 23.82 R8 13.408 d8= 0.364 R9 14.681 d9= 1.426 nd5 1.5444 v5 55.82 R10 −3.389 d10= 0.562 R11 −6.158 d11= 0.600 nd6 1.5346 v6 55.69 R12 2.787 d12= 0.460 R13 ∞ d13= 0.210 ndg 1.5168 vg 64.20 R14 ∞ d14= 0.344

In the table, meanings of various symbols will be described as follows.

S1: aperture;

R: curvature radius of an optical surface, central curvature radius for a lens;

R1: curvature radius of the object side surface of the first lens L1;

R2: curvature radius of the image side surface of the first lens L1;

R3: curvature radius of the object side surface of the second lens L2;

R4: curvature radius of the image side surface of the second lens L2;

R5: curvature radius of the object side surface of the third lens L3;

R6: curvature radius of the image side surface of the third lens L3;

R7: curvature radius of the object side surface of the fourth lens L4;

R8: curvature radius of the image side surface of the fourth lens L4;

R9: curvature radius of the object side surface of the fifth lens L5;

R10: curvature radius of the image side surface of the fifth lens L5;

R11: curvature radius of the object side surface of the sixth lens L6;

R12: curvature radius of the image side surface of the sixth lens L6;

R13: curvature radius of an object side surface of the optical filter GF;

R14: curvature radius of an image side surface of the optical filter GF;

d: on-axis thickness of a lens and an on-axis distance between lenses;

d0: on-axis distance from the aperture S1 to the object side surface of the first lens L1;

d1: on-axis thickness of the first lens L1;

d2: on-axis distance from the image side surface of the first lens L1 to the object side surface of the second lens L2;

d3: on-axis thickness of the second lens L2;

d4: on-axis distance from the image side surface of the second lens L2 to the object side surface of the third lens L3;

d5: on-axis thickness of the third lens L3;

d6: on-axis distance from the image side surface of the third lens L3 to the object side surface of the fourth lens L4;

d7: on-axis thickness of the fourth lens L4;

d8: on-axis distance from the image side surface of the fourth lens L4 to the object side surface of the fifth lens L5;

d9: on-axis thickness of the fifth lens L5;

d10: on-axis distance from the image side surface of the fifth lens L5 to the object side surface of the sixth lens L6;

d11: on-axis thickness of the sixth lens L6;

d12: on-axis distance from the image side surface of the sixth lens L6 to the object side surface of the optical filter GF;

d13: on-axis thickness of the optical filter GF;

d14: on-axis distance from the image side surface of the optical filter GF to the image plane;

nd: refractive index of d line;

nd1: refractive index of d line of the first lens L1;

nd2: refractive index of d line of the second lens L2;

nd3: refractive index of d line of the third lens L3;

nd4: refractive index of d line of the fourth lens L4;

nd5: refractive index of d line of the fifth lens L5;

nd6: refractive index of d line of the sixth lens L6;

ndg: refractive index of d line of the optical filter GF;

vd: abbe number;

v1: abbe number of the first lens L1;

v2: abbe number of the second lens L2;

v3: abbe number of the third lens L3;

v4: abbe number of the fourth lens L4;

v5: abbe number of the fifth lens L5;

v6: abbe number of the sixth lens L6;

vg: abbe number of the optical filter GF.

Table 2 shows aspheric surface data of respective lens in the camera optical lens 10 according to Embodiment 1 of the present invention.

TABLE 2 Conic coefficient Aspherical surface coefficients k A4 A6 A8 A10 A12 R1 −7.6130E−01   6.4835E−03 5.0403E−02 −1.2852E−01 1.9612E−01 −1.8124E−01 R2 0.0000E+00 −5.4213E−02 1.3288E−01 −2.9762E−01 4.9211E−01 −5.3616E−01 R3 0.0000E+00 −8.0904E−02 1.4539E−01 −2.4817E−01 4.3329E−01 −5.3502E−01 R4 0.0000E+00 −4.4971E−02 1.3040E−01 −3.0363E−01 6.8215E−01 −9.6524E−01 R5 0.0000E+00 −6.1715E−02 1.0405E−01 −3.0885E−01 5.9097E−01 −7.4543E−01 R6 0.0000E+00 −1.4253E−01 2.0513E−01 −3.5878E−01 4.2234E−01 −3.4123E−01 R7 0.0000E+00 −1.6180E−01 2.0307E−01 −2.6362E−01 2.5412E−01 −1.7624E−01 R8 0.0000E+00 −8.4678E−02 6.0692E−02 −2.9842E−02 8.0705E−03  3.3159E−03 R9 0.0000E+00 −3.0889E−02 8.6058E−03 −6.4720E−04 −1.7631E−03   1.4158E−03 R10 0.0000E+00  1.1654E−02 −5.0482E−03   9.3882E−04 5.7135E−04 −5.0386E−04 R11 −1.0000E+00  −7.9775E−02 2.3500E−02 −6.5425E−03 2.2710E−03 −8.0690E−04 R12 −9.4543E+00  −4.2813E−02 1.3340E−02 −3.2194E−03 5.5331E−04 −6.8569E−05 Conic coefficient Aspherical surface coefficients k A14 A16 A18 A20 R1 −7.6130E−01  1.0458E−01 −3.6965E−02 7.3769E−03 −6.4093E−04 R2 0.0000E+00 3.7560E−01 −1.6313E−01 4.0051E−02 −4.2623E−03 R3 0.0000E+00 4.2641E−01 −2.0957E−01 5.8012E−02 −6.9673E−03 R4 0.0000E+00 8.5619E−01 −4.6949E−01 1.4976E−01 −2.1591E−02 R5 0.0000E+00 6.0056E−01 −2.8863E−01 7.3673E−02 −7.2442E−03 R6 0.0000E+00 1.9059E−01 −6.5660E−02 1.1447E−02 −6.3277E−04 R7 0.0000E+00 9.7660E−02 −4.0006E−02 9.7720E−03 −1.0175E−03 R8 0.0000E+00 −3.4931E−03   1.1105E−03 −1.5570E−04   7.9537E−06 R9 0.0000E+00 −4.9308E−04   8.9973E−05 −8.4724E−06   3.2664E−07 R10 0.0000E+00 1.6357E−04 −2.6458E−05 2.1342E−06 −6.8876E−08 R11 −1.0000E+00  1.9181E−04 −2.5707E−05 1.7746E−06 −4.9434E−08 R12 −9.4543E+00  5.9537E−06 −3.3952E−07 1.1312E−08 −1.6550E−10

In Table 2, k is a conic coefficient, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 are aspheric surface coefficients.

y=(x ² /R)/[1+{1−(k+1)(x ² /R ²)}^(1/2)]+A4x ⁴ +A6x ⁶ +A8x ⁸ +A10x ¹⁰ +A12x ¹² +A14x ¹⁴ +A16x ¹⁶ +A18x ¹⁸ +A20x ²⁰  (1)

where x is a vertical distance between a point on an aspherical curve and the optic axis, and y is an aspherical depth (a vertical distance between a point on an aspherical surface, having a distance of x from the optic axis, and a surface tangent to a vertex of the aspherical surface on the optic axis).

In an embodiment, an aspheric surface of each lens surface may use the aspheric surfaces shown in the above condition (1). However, the present invention is not limited to the aspherical polynomials form shown in the condition (1).

Table 3 and Table 4 show design data of inflexion points and arrest points of respective lens in the camera optical lens 10 according to Embodiment 1 of the present invention. P1R1 and P1R2 represent the object side surface and the image side surface of the first lens L1, respectively; P2R1 and P2R2 represent the object side surface and the image side surface of the second lens L2, respectively; P3R1 and P3R2 represent the object side surface and the image side surface of the third lens L3, respectively; P4R1 and P4R2 represent the object side surface and the image side surface of the fourth lens L4, respectively; P5R1 and P5R2 represent the object side surface and the image side surface of the fifth lens L5, respectively; and P6R1 and P6R2 represent the object side surface and the image side surface of the sixth lens L6, respectively. The data in the column “inflexion point position” refers to vertical distances from inflexion points arranged on each lens surface to the optic axis of the camera optical lens 10. The data in the column “arrest point position” refers to vertical distances from arrest points arranged on each lens surface to the optic axis of the camera optical lens 10.

TABLE 3 Number of Inflexion point Inflexion point Inflexion point inflexion points position 1 position 2 position 3 P1R1 0 / / / P1R2 1 1.315 / / P2R1 0 / / / P2R2 0 / / / P3R1 2 0.335 1.085 / P3R2 2 0.245 1.145 / P4R1 3 0.245 1.065 1.435 P4R2 3 0.295 1.055 1.685 P5R1 3 0.465 1.535 2.005 P5R2 2 2.115 2.385 / P6R1 2 2.095 2.775 / P6R2 2 0.725 3.485 /

TABLE4 Number of Arrest point Arrest point arrest points position 1 position 2 P1R1 0 / / P1R2 0 / / P2R1 0 / / P2R2 0 / / P3R1 1 0.575 / P3R2 1 0.445 / P4R1 1 0.445 / P4R2 2 0.545 1.345 P5R1 1 0.865 / P5R2 0 / / P6R1 0 / / P6R2 1 1.635 /

FIG. 2 and FIG. 3 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 470 nm, 555 nm and 650 nm after passing the camera optical lens 10 according to Embodiment 1. FIG. 4 illustrates a field curvature and a distortion of light with a wavelength of 555 nm after passing the camera optical lens 10 according to Embodiment 1, in which a field curvature S is a field curvature in a sagittal direction and T is a field curvature in a tangential direction.

Table 13 below further lists various values of Embodiments 1, 2 and 3 and values corresponding to parameters which are specified in the above conditions.

As shown in Table 13, Embodiment 1 satisfies the respective conditions.

In this embodiment, the entrance pupil diameter (ENPD) of the camera optical lens 10 is 2.885 mm. The image height of 1.0H is 4.595 mm. The FOV (field of view) along a diagonal direction is 78.64°. Thus, the camera optical lens can provide a large-aperture, ultra-thin, wide-angle lens while having on-axis and off-axis aberrations sufficiently corrected, thereby leading to better optical characteristics.

Embodiment 2

Embodiment 2 is basically the same as Embodiment 1 and involves symbols having the same meanings as Embodiment 1. Only differences therebetween will be described in the following.

Table 5 and Table 6 show design data of a camera optical lens 20 in Embodiment 2 of the present invention.

TABLE 5 R d nd vd S1 ∞ d0= −0.573 R1 1.975 d1= 0.840 nd1 1.5444 v1 55.82 R2 10.252 d2= 0.131 R3 10.482 d3= 0.277 nd2 1.6700 v2 19.39 R4 3.841 d4= 0.404 R5 10.535 d5= 0.400 nd3 1.5346 v3 55.69 R6 8.313 d6= 0.174 R7 8.808 d7= 0.400 nd4 1.5661 v4 37.71 R8 21.244 d8= 0.355 R9 53.944 d9= 1.370 nd5 1.5444 v5 55.82 R10 −2.958 d10= 0.555 R11 −3.825 d11= 0.600 nd6 1.5346 v6 55.69 R12 3.529 d12= 0.460 R13 ∞ d13= 0.210 ndg 1.5168 vg 64.20 R14 ∞ d14= 0.321

Table 6 shows aspheric surface data of respective lenses in the camera optical lens 20 according to Embodiment 2 of the present invention.

TABLE 6 Conic coefficient Aspherical surface coefficients k A4 A6 A8 A10 A12 R1 −7.7539E−01   1.0074E−02 2.0143E−02 −3.9001E−02 5.4036E−02 −4.9204E−02 R2 0.0000E+00 −3.2177E−02 8.2041E−02 −1.7629E−01 2.7022E−01 −2.7213E−01 R3 0.0000E+00 −3.9093E−02 9.5813E−02 −1.6581E−01 2.6531E−01 −2.9564E−01 R4 0.0000E+00 −2.2076E−02 1.2874E−01 −3.2668E−01 6.9349E−01 −9.5934E−01 R5 0.0000E+00 −7.1189E−02 1.0981E−01 −3.0742E−01 5.8972E−01 −7.4659E−01 R6 0.0000E+00 −8.1296E−02 3.1457E−02  3.2294E−02 −9.9001E−02   8.8631E−02 R7 0.0000E+00 −8.7175E−02 1.9534E−02  8.6281E−02 −1.6881E−01   1.5558E−01 R8 0.0000E+00 −6.0491E−02 −2.8203E−02   1.1368E−01 −1.3755E−01   9.6044E−02 R9 0.0000E+00 −2.8891E−02 −1.0706E−02   1.8809E−02 −1.3963E−02   6.6351E−03 R10 0.0000E+00  1.5029E−02 −2.7786E−03  −8.6839E−03 8.1767E−03 −3.3989E−03 R11 −1.0000E+00  −4.3832E−02 9.9149E−03 −1.4474E−02 1.1616E−02 −4.5582E−03 R12 −8.0842E+00  −3.4076E−02 6.9368E−03 −1.2607E−03 2.3838E−04 −4.1610E−05 Conic coefficient Aspherical surface coefficients k A14 A16 A18 A20 R1 −7.7539E−01  3.0265E−02 −1.2147E−02 2.8697E−03 −3.0539E−04 R2 0.0000E+00 1.7556E−01 −7.0047E−02 1.5749E−02 −1.5321E−03 R3 0.0000E+00 2.1194E−01 −9.2665E−02 2.2437E−02 −2.3020E−03 R4 0.0000E+00 8.5741E−01 −4.7606E−01 1.4997E−01 −2.0239E−02 R5 0.0000E+00 6.0007E−01 −2.8809E−01 7.3810E−02 −7.3471E−03 R6 0.0000E+00 −2.9845E−02  −1.5337E−03 3.2654E−03 −5.5185E−04 R7 0.0000E+00 −7.9097E−02   2.2580E−02 −3.3892E−03   2.0742E−04 R8 0.0000E+00 −3.9660E−02   9.4999E−03 −1.2219E−03   6.5369E−05 R9 0.0000E+00 −1.8915E−03   3.0782E−04 −2.6355E−05   9.2350E−07 R10 0.0000E+00 7.7100E−04 −9.5892E−05 5.9041E−06 −1.2864E−07 R11 −1.0000E+00  9.8527E−04 −1.2000E−04 7.7525E−06 −2.0747E−07 R12 −8.0842E+00  5.0523E−06 −3.7435E−07 1.5209E−08 −2.5928E−10

Table 7 and Table 8 show design data of inflexion points and arrest points of respective lens in the camera optical lens 20 according to Embodiment 2 of the present invention.

TABLE 7 Number of Inflexion Inflexion Inflexion Inflexion inflexion point point point point points position 1 position 2 position 3 position 4 P1R1 0 / / / / P1R2 1 1.175 / / / P2R1 0 / / / / P2R2 0 / / / / P3R1 2 0.405 1.105 / / P3R2 2 0.385 1.225 / / P4R1 3 0.355 1.085 1.605 / P4R2 3 0.255 1.115 1.795 / P5R1 4 0.235 1.485 1.865 2.095 P5R2 1 2.385 / / / P6R1 1 2.125 / / / P6R2 3 0.775 3.385 3.655 /

TABLE 8 Number of Arrest point Arrest point arrest points position 1 position 2 P1R1 0 / / P1R2 0 / / P2R1 0 / / P2R2 0 / / P3R1 2 0.705 1.215 P3R2 1 0.715 / P4R1 2 0.675 1.325 P4R2 2 0.435 1.425 P5R1 1 0.385 / P5R2 0 / / P6R1 0 / / P6R2 1 1.595 /

FIG. 6 and FIG. 7 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 470 nm, 555 nm and 650 nm after passing the camera optical lens 20 according to Embodiment 2. FIG. 8 illustrates a field curvature and a distortion of light with a wavelength of 555 nm after passing the camera optical lens 20 according to Embodiment 2.

As shown in Table 13, Embodiment 2 satisfies the respective conditions.

In this embodiment, the entrance pupil diameter (ENPD) of the camera optical lens 20 is 2.875 mm. The image height of 1.0H is 4.595 mm. The FOV (field of view) along a diagonal direction is 78.62°. Thus, the camera optical lens 20 can provide a large-aperture, ultra-thin, wide-angle lens while having on-axis and off-axis aberrations sufficiently corrected, thereby leading to better optical characteristics.

Embodiment 3

Embodiment 3 is basically the same as Embodiment 1 and involves symbols having the same meanings as Embodiment 1. Only differences therebetween will be described in the following.

Table 9 and Table 10 show design data of a camera optical lens 30 in Embodiment 3 of the present invention.

TABLE 9 R d nd vd S1 ∞ d0= −0.597 R1 1.998 d1= 0.840 nd1 1.5444 v1 55.82 R2 10.785 d2= 0.118 R3 5.952 d3= 0.254 nd2 1.6700 v2 19.39 R4 2.995 d4= 0.417 R5 11.903 d5= 0.400 nd3 1.5346 v3 55.69 R6 9.149 d6= 0.179 R7 10.019 d7= 0.410 nd4 1.5661 v4 37.71 R8 29.452 d8= 0.356 R9 47.365 d9= 1.369 nd5 1.5444 v5 55.82 R10 −2.985 d10= 0.549 R11 −3.923 d11= 0.612 nd6 1.5346 v6 55.69 R12 3.326 d12= 0.460 R13 ∞ d13= 0.210 ndg 1.5168 vg 64.20 R14 ∞ d14= 0.325

Table 10 shows aspheric surface data of respective lenses in the camera optical lens 30 according to Embodiment 3 of the present invention.

TABLE 10 Conic coefficient Aspherical surface coefficients k A4 A6 A8 A10 A12 R1 −7.7762E−01   1.0056E−02 1.9485E−02 −3.9128E−02 5.4572E−02 −4.9338E−02 R2 0.0000E+00 −3.2854E−02 5.7369E−02 −8.9257E−02 1.2980E−01 −1.3815E−01 R3 0.0000E+00 −8.2416E−02 2.0183E−01 −4.4713E−01 8.1932E−01 −1.0075E+00 R4 0.0000E+00 −4.7593E−02 1.4154E−01 −3.2370E−01 6.8594E−01 −9.6045E−01 R5 0.0000E+00 −7.0596E−02 1.1046E−01 −3.0682E−01 5.9012E−01 −7.4642E−01 R6 0.0000E+00 −1.1628E−01 2.1357E−01 −4.7793E−01 7.3897E−01 −7.5819E−01 R7 0.0000E+00 −8.8135E−02 3.6506E−02  2.6189E−02 −7.6891E−02   7.9067E−02 R8 0.0000E+00 −6.5308E−02 −5.0120E−03   6.4972E−02 −8.4469E−02   6.3088E−02 R9 0.0000E+00 −2.7930E−02 −1.1033E−02   1.7072E−02 −1.2361E−02   6.2185E−03 R10 0.0000E+00  1.9602E−02 −1.0154E−02  −1.7381E−03 4.2375E−03 −2.0822E−03 R11 −1.0000E+00  −4.1735E−02 2.6335E−04 −2.9724E−03 5.1331E−03 −2.5177E−03 R12 −8.1411E+00  −3.7383E−02 8.2876E−03 −1.4225E−03 2.1525E−04 −3.2074E−05 Conic coefficient Aspherical surface coefficients k A14 A16 A18 A20 R1 −7.7762E−01  3.0141E−02 −1.2079E−02 2.8632E−03 −3.0230E−04 R2 0.0000E+00 9.6929E−02 −4.2294E−02 1.0407E−02 −1.1082E−03 R3 0.0000E+00 7.9131E−01 −3.8067E−01 1.0217E−01 −1.1726E−02 R4 0.0000E+00 8.6310E−01 −4.7857E−01 1.5001E−01 −2.0239E−02 R5 0.0000E+00 6.0034E−01 −2.8816E−01 7.3642E−02 −7.2861E−03 R6 0.0000E+00 5.0508E−01 −2.0714E−01 4.7180E−02 −4.5414E−03 R7 0.0000E+00 −4.1599E−02   1.1744E−02 −1.6778E−03   9.3420E−05 R8 0.0000E+00 −2.7532E−02   6.8841E−03 −9.1721E−04   5.0632E−05 R9 0.0000E+00 −1.9442E−03   3.5433E−04 −3.4759E−05   1.4321E−06 R10 0.0000E+00 5.1358E−04 −6.7617E−05 4.3623E−06 −9.9885E−08 R11 −1.0000E+00  6.0619E−04 −7.8705E−05 5.3146E−06 −1.4732E−07 R12 −8.1411E+00  3.7443E−06 −2.8022E−07 1.1680E−08 −2.0519E−10

Table 11 and Table 12 show design data of inflexion points and arrest points of respective lens in the camera optical lens 30 according to Embodiment 3 of the present invention.

TABLE 11 Number of Inflexion Inflexion Inflexion Inflexion inflexion point point point point points position 1 position 2 position 3 position 4 P1R1 0 / / / / P1R2 1 1.315 / / / P2R1 0 / / / / P2R2 0 / / / / P3R1 2 0.375 1.065 / / P3R2 2 0.355 1.185 / / P4R1 3 0.335 1.085 1.605 / P4R2 3 0.215 1.115 1.785 / P5R1 4 0.245 1.475 1.885 2.105 P5R2 1 2.375 / / / P6R1 1 2.115 / / / P6R2 2 0.765 3.355 / /

TABLE 12 Number of Arrest point Arrest point arrest points position 1 position 2 P1R1 0 / / P1R2 0 / / P2R1 0 / / P2R2 0 / / P3R1 2 0.665 1.195 P3R2 2 0.645 1.385 P4R1 2 0.615 1.365 P4R2 2 0.365 1.455 P5R1 1 0.415 / P5R2 0 / / P6R1 0 / / P6R2 1 1.595 /

FIG. 10 and FIG. 11 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 470 nm, 555 nm and 650 nm after passing the camera optical lens 30 according to Embodiment 3. FIG. 12 illustrates field curvature and distortion of light with a wavelength of 555 nm after passing the camera optical lens 30 according to Embodiment 3.

Table 13 below further lists various values of the present embodiment and values corresponding to parameters which are specified in the above conditions. Obviously, the camera optical lens according to this embodiment satisfies the above conditions.

In this embodiment, the entrance pupil diameter (ENPD) of the camera optical lens 30 is 2.875 mm. The image height of 1.0H is 4.595 mm. The FOV (field of view) along a diagonal direction is 78.62°. Thus, the camera optical lens 30 can provide a large-aperture, ultra-thin, wide-angle lens while having on-axis and off-axis aberrations sufficiently corrected, thereby leading to better optical characteristics.

TABLE 13 Parameters and Embodi- Embodi- Embodi- Conditions ment 1 ment 2 ment 3 R10/(R11 + R12) 1.00 9.99 5.00 R9/(R7 + R8) 0.60 1.80 1.20 R5/R3 2.99 1.01 2.00 f 5.462 5.461 5.486 f1 4.512 4.324 4.343 f2 −10.788 −9.121 −9.237 f3 −78.592 −78.430 −77.669 f4 83.934 26.149 26.491 f5 5.185 5.178 5.192 f6 −3.495 −3.328 −3.260 f12 6.549 6.749 6.718 FNO 1.89 1.90 1.91 TTL 6.495 6.497 6.497 IH 4.595 4.595 4.595 FOV 78.64° 78.62° 78.62°

It can be appreciated by one having ordinary skill in the art that the description above is only embodiments of the present invention. In practice, one having ordinary skill in the art can make various modifications to these embodiments in forms and details without departing from the spirit and scope of the present invention. 

1. A camera optical lens, comprising, sequentially from an object side to an image side: a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens having a negative refractive power; a fourth lens having a positive refractive power; a fifth lens having a positive refractive power; and a sixth lens having a negative refractive power, wherein the camera optical lens satisfies following conditions: 1.00

R10/(R11+R12)

10.00; 0.60

R9/(R7+R8)

1.80; 1.00

R5/R3

3.00; and 3.12

(R5+R6)/(R5−R6)

12.73, where R3 denotes a curvature radius of an object side surface of the second lens; R5 denotes a curvature radius of an object side surface of the third lens; R6 denotes a curvature radius of the image side surface of the third lens; R7 denotes a curvature radius of an object side surface of the fourth lens; R8 denotes a curvature radius of an image side surface of the fourth lens; R9 denotes a curvature radius of an object side surface of the fifth lens; R10 denotes a curvature radius of an image side surface of the fifth lens; R11 denotes a curvature radius of an object side surface of the sixth lens; and R12 denotes a curvature radius of an image side surface of the sixth lens.
 2. The camera optical lens as described in claim 1, wherein the first lens comprises an object side surface being convex in a paraxial region and an image side surface being concave in the paraxial region, and the camera optical lens satisfies following conditions: 0.40

f1/f

1.24; −3.28

(R1+R2)/(R1−R2)

−0.97; and 0.06

d1/TTL

0.19, where f denotes a focal length of the camera optical lens; f1 denotes a focal length of the first lens; R1 denotes a curvature radius of the object side surface of the first lens; R2 denotes a curvature radius of the image side surface of the first lens; d1 denotes an on-axis thickness of the first lens; and TTL denotes a total optical length from the object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 3. The camera optical lens as described in claim 2, further satisfying following conditions: 0.63

f1/f

0.99; −2.05

(R1+R2)/(R1−R2)

−1.21; and 0.10

d1/TTL≤0.16.
 4. The camera optical lens as described in claim 1, wherein the object side surface of the second lens is convex in a paraxial region, the second lens further comprises an image side surface being concave in the paraxial region, and the camera optical lens satisfies following conditions: −3.95

f2/f

−1.11; 1.08

(R3+R4)/(R3−R4)

5.19; and 0.02

d3/TTL

0.06, where f denotes a focal length of the camera optical lens; f2 denotes a focal length of the second lens; R4 denotes a curvature radius of the image side surface of the second lens; d3 denotes an on-axis thickness of the second lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 5. The camera optical lens as described in claim 4, further satisfying following conditions: −2.47

f2/f

−1.39; 1.73

(R3+R4)/(R3−R4)

4.15; and 0.03

d3/TTL

0.06.
 6. The camera optical lens as described in claim 1, wherein the object side surface of the third lens is convex in a paraxial region, the third lens further comprises an image side surface being concave in the paraxial region, and the camera optical lens satisfies following conditions: −28.78

f3/f

9.44; 0.03

d5/TTL

0.09, where f denotes a focal length of the camera optical lens; f3 denotes a focal length of the third lens; and R6 denotes a curvature radius of the image side surface of the third lens; d5 denotes an on-axis thickness of the third lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 7. The camera optical lens as described in claim 6, further satisfying following conditions: −26.00

f3/f

−11.80; 5.00

(R5+R6)/(R5−R6)

10.18; and 0.05

d5/TTL

0.08.
 8. The camera optical lens as described in claim 1, wherein the object side surface of the fourth lens is convex in a paraxial region, the image side surface of the fourth lens is concave in the paraxial region, and the camera optical lens satisfies following conditions: 2.39

f4/f

23.05; −19.03

(R7+R8)/(R7−R8)

−1.35; and 0.03

d7/TTL

0.09, where f denotes a focal length of the camera optical lens; f4 denotes a focal length of the fourth lens; d7 denotes an on-axis thickness of the fourth lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 9. The camera optical lens as described in claim 8, further satisfying following conditions: 3.83

f4/f

18.44; −14.00

(R7+R8)/(R7−R8)

−1.69; and 0.04

d7/TTL

0.08.
 10. The camera optical lens as described in claim 1, wherein the object side surface of the fifth lens is convex in a paraxial region, the image side surface of the fifth lens is convex in the paraxial region, and the camera optical lens satisfies following conditions: 0.47

f5/f

1.42; 0.31

(R9+R10)/(R9−R10)

1.34; and 0.09

d9/TTL

0.33, where f denotes a focal length of the camera optical lens; f5 denotes a focal length of the fifth lens; d9 denotes an on-axis thickness of the fifth lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 11. The camera optical lens as described in claim 10, further satisfying following conditions: 0.76

f5/f

1.14; 0.50

(R9+R10)/(R9−R10)

1.08; and 0.09

d9/TTL

0.26.
 12. The camera optical lens as described in claim 1, wherein the object side surface of the sixth lens is concave in a paraxial region, the image side surface of the sixth lens is concave in the paraxial region, and the camera optical lens satisfies following conditions: −1.28

f6/f

−0.40; 0.02

(R11+R12)/(R11−R12)

0.57; and 0.05

d11/TTL

0.14, where f denotes a focal length of the camera optical lens; f6 denotes a focal length of the sixth lens; d11 denotes an on-axis thickness of the sixth lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 13. The camera optical lens as described in claim 12, further satisfying following conditions: −0.80

f6/f

−0.50; 0.03

(R11+R12)/(R11−R12)

0.45; and 0.07

d11/TTL

0.11.
 14. The camera optical lens as described in claim 1, wherein an F number FNO of the camera optical lens is smaller than or equal to 1.97.
 15. The camera optical lens as described in claim 14, wherein the F number FNO of the camera optical lens is smaller than or equal to 1.93.
 16. The camera optical lens as described in claim 1, wherein a total optical length TTL from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis is smaller than or equal to 7.15 mm.
 17. The camera optical lens as described in claim 16, wherein the total optical length TTL is smaller than or equal to 6.82 mm. 